Core pack assembly, battery, battery pack and vehicle

Abstract

The utility model provides a core package assembly, a battery, a battery pack and a vehicle, wherein the core package assembly comprises a core package, and the core package is provided with a tab; and the seepage absorption piece is arranged on the outer surface of the core package, and the seepage absorption piece and the tab are located on the same side of the core package so as to be used for absorbing the electrolyte outside the core package and transferring the electrolyte to the core package. By arranging the seepage absorption piece on the side surface of the core bag, the electrolyte which is difficult to utilize outside the core bag can be absorbed, and the part of electrolyte is transferred to the core bag, so that the capacity of the electrolyte in the core bag is increased in a disguised manner under the condition of not changing the volume of the battery, and the service life of the battery is prolonged. Therefore, the technical problem that the cycle performance is sharply reduced due to too fast electrolyte consumption in the use process of the battery is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a core pack assembly, a battery, a battery pack, and a vehicle. Background Technology

[0002] In recent years, lithium-ion batteries have developed rapidly due to their characteristics such as high operating voltage, light weight, small size, no memory effect, low self-discharge, and long cycle life. They are widely used in various mobile devices, and the requirements for the long cycle performance of lithium-ion batteries are becoming increasingly stringent.

[0003] However, the amount of electrolyte inside the cell of a lithium-ion battery is usually fixed. In the later stages of lithium-ion battery cycling, when the electrolyte inside the cell is consumed in large quantities, the energy storage performance of the lithium-ion battery will drop sharply, resulting in the phenomenon of "cycle drop". Utility Model Content

[0004] Embodiments of this utility model provide a core pack assembly, a battery, a battery pack, and a vehicle, which can improve the technical problem of the rapid decline in the cycle performance of batteries in related technologies.

[0005] In a first aspect, embodiments of the present invention provide a core package assembly, comprising:

[0006] Core package, the core package being provided with electrode tabs; and,

[0007] An absorbent element is disposed on the outer surface of the core package, and the absorbent element and the tab are located on the same side of the core package to absorb the electrolyte outside the core package and transfer the electrolyte to the inside of the core package.

[0008] In one embodiment, the core package includes stacked electrodes and a diaphragm, the electrodes having tabs on at least one side edge along a first direction, and the absorbent covering the same side edge of the electrodes and the diaphragm along the first direction for absorbing electrolyte outside the core package and transferring the electrolyte between the electrodes and the diaphragm.

[0009] In one embodiment, the thickness of the absorbent element in its expanded state is D1, and the thickness of the absorbent element under 1 ton of pressure is D2, where 0.02 ≤ D2 / D1 ≤ 0.6; and / or,

[0010] The oil absorption value of the absorbent element is a, 0.15 g / cm³. 3 ≤a≤1.1g / cm 3 .

[0011] In one embodiment, the absorbent element includes at least one selected from polyethylene, polypropylene fiber, polytetrafluoroethylene, nonwoven fabric, aramid, and polyamide.

[0012] In one embodiment, the absorbent element is spaced apart from the adjacent tab.

[0013] In one embodiment, the distance between the absorbent element and the adjacent tab is L, where 3mm ≤ L ≤ 10mm.

[0014] In one embodiment, the absorbent element has one or more through holes.

[0015] In one embodiment, the tab is provided on at least one side of the core package along a first direction; the through hole includes a first through hole extending along the first direction.

[0016] In one embodiment, the diameter of the first through hole is d1, where 1mm ≤ d1 ≤ 4mm.

[0017] In one embodiment, the through hole further includes a second through hole, one end of which communicates with the first through hole, and the other end of which faces the vent hole on the battery casing.

[0018] In one embodiment, the diameter of the second through hole is d2, and the thickness of the absorbent is D1, where 1mm ≤ d2 < D1.

[0019] In one embodiment, the porosity of the through hole is b, where 10% ≤ b ≤ 30%.

[0020] In one embodiment, the core package assembly further includes insulating tape, through which the core package and the absorbent are connected.

[0021] Secondly, embodiments of the present invention provide a battery, comprising:

[0022] The outer shell; and,

[0023] The core package assembly as described in the foregoing embodiments is disposed within the housing.

[0024] Thirdly, embodiments of the present invention provide a battery pack including the battery as described in the foregoing embodiments.

[0025] Fourthly, embodiments of the present invention provide a vehicle including a battery as described in the foregoing embodiments or a battery pack as described in the foregoing embodiments.

[0026] The beneficial effects of the embodiments of this utility model are as follows:

[0027] In an embodiment of this utility model, by providing an absorbent on the side of the tab of the core pack, electrolyte that is difficult to use outside the core pack can be absorbed and transferred to the inside of the core pack. This effectively increases the electrolyte capacity in the core pack without changing the battery volume, thereby improving the technical problem of rapid electrolyte consumption and sharp decline in cycle performance during battery use. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the core package assembly provided in an embodiment of the present invention;

[0030] Figure 2 This is a right view of the battery cell pack assembly provided in an embodiment of this utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the absorbent element provided in an embodiment of this utility model;

[0032] Figure 4 This is a three-dimensional schematic diagram of the absorbent element provided in an embodiment of this utility model;

[0033] Figure 5 This is a front view of the absorbent element provided in an embodiment of this utility model;

[0034] Figure 6 This is a cross-sectional view of the battery provided in an embodiment of this utility model;

[0035] Figure 7 yes Figure 5 Enlarged view of point A in the middle;

[0036] Figure 8 This is a top view of the absorbent element provided in an embodiment of this utility model.

[0037] The labels in the diagram are as follows:

[0038] 1. Core-packaging assembly;

[0039] 11. Core package; 111. Tab; 112. Electrode; 113. Separator;

[0040] 12. Absorption element; 121. Through hole; 1211. First through hole; 1212. Second through hole;

[0041] 13. Insulating tape;

[0042] 2. Battery; 21. Casing; 211. Vent;

[0043] H1, first direction; H2, second direction. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0045] Taking lithium-ion batteries as an example, the amount of electrolyte inside the cell of a secondary battery is usually fixed. In the later stages of the secondary battery cycle, when the electrolyte inside the cell is consumed in large quantities, the energy storage performance of the secondary battery will drop sharply, resulting in the phenomenon of "cycle drop".

[0046] The inventors discovered that the amount of electrolyte stored in a lithium-ion battery can be increased by reducing the areal density of the electrode sheets and increasing the thickness of the separator. However, these measures also reduce the energy density of the lithium-ion battery, causing a decrease in its capacity and significantly impacting the user experience.

[0047] Based on this, in this embodiment of the invention, by providing an absorbent element that can absorb the electrolyte free outside the core pack and transfer it to the inside of the core pack, the technical problem of rapid electrolyte consumption leading to a sharp decline in cycle performance during the use of lithium-ion batteries can be improved. A detailed explanation follows.

[0048] Firstly, this utility model provides a core-packaging assembly 1, which, in some embodiments, refers to... Figure 1 The core package assembly 1 includes:

[0049] Core package 11, core package 11 is provided with electrode tabs 111; and,

[0050] Absorption element 12 is disposed on the outer surface of core package 11. Absorption element 12 and tab 111 are located on the same side of core package 11 to absorb electrolyte outside core package 11 and transfer electrolyte to the inside of core package 11.

[0051] Specifically, the absorbent 12 can absorb the electrolyte free outside the core pack 11 and store it inside the absorbent 12. When the core pack 11 consumes a certain amount of electrolyte during the cycle, due to the effect of diffusion, the electrolyte in the absorbent 12 connected to the core pack 11 will replenish the core pack 11, thereby improving the cycle performance of the core pack 11. On the other hand, during the repeated charging and discharging of the core pack 11, the temperature of the core pack 11 will continuously rise, which will also cause the core pack 11 to expand and be squeezed by the outer shell 21, thereby squeezing the electrolyte out of the core pack 11. At this time, the absorbent 12 provided on the side of the core pack 11 can also absorb the squeezed electrolyte, and after the core pack 11 cools down or the electrolyte in the core pack 11 is consumed, guide the electrolyte into the core pack 11 to replenish the electrolyte in the core pack 11.

[0052] The absorbent element 12 typically absorbs and stores electrolyte through capillary action, preventing electrolyte leakage while guiding the electrolyte back into the core package 11, thereby maintaining the normal operation of the core package 11. For example, the absorbent element 12 can be a woven fiber mesh structure or a porous structure similar to a sponge to ensure sufficient liquid absorption capacity. There are various ways to connect the absorbent element 12 to the core package 11. It can be achieved by placing a corrosion-resistant adhesive between the core package 11 and the absorbent element 12; it can also be achieved by hot-pressing the absorbent element 12 onto the outer surface of the core package 11; or a connecting structure can be provided between the absorbent element 12 and the core package 11, such as a protrusion on the core package 11 and a corresponding groove on the absorbent element 12, with the protrusion and groove working together to achieve a stable connection between the absorbent element 12 and the core package 11.

[0053] Understandably, the core pack 11 typically has two tabs 111, and correspondingly, two absorbent elements 12 can also be provided, thereby absorbing electrolyte over a larger area, reducing the mass of electrolyte free outside the core pack 11, and replenishing the core pack 11 with more electrolyte, further improving the cycle performance of the core pack 11. The shape, material, and size of the two absorbent elements 12 can be set as needed, and they can be arranged symmetrically or asymmetrically; this utility model does not impose any restrictions on this.

[0054] In this embodiment of the invention, by providing an absorbent 12 on the side of the core pack 11, electrolyte that is difficult to utilize outside the core pack 11 can be absorbed and transferred to the core pack 11. Without changing the volume of the battery 2, the electrolyte capacity in the core pack 11 is effectively increased, thereby improving the technical problem of rapid electrolyte consumption leading to a sharp decline in cycle performance during battery 2 use. Furthermore, the absorbent 12 can also absorb electrolyte squeezed out when the core pack 11 encounters external impact or temperature rise, effectively slowing down the rate of electrolyte leakage from the core pack 11 and maintaining the performance of the core pack 11 at a high level.

[0055] In some embodiments, refer to Figure 2 The core package 11 includes stacked electrode sheets 112 and diaphragm 113. The electrode sheets 112 have tabs 111 on at least one side edge along the first direction H1. The absorbent member 12 covers the same side edge of the electrode sheets 112 and the diaphragm 113 along the first direction H1 to absorb electrolyte outside the core package 11 and transfer the electrolyte between the electrode sheets 112 and the diaphragm 113.

[0056] The core pack 11 can be either wound or stacked. A tab 111 made of conductive material (such as copper, aluminum, nickel, or various alloys) is provided on the side of the core pack 11 for electrical connection between the core pack 11 and an external circuit. Taking a stacked core pack 11 as an example, it includes positive electrode 112, negative electrode 112, and a separator 113 stacked on top of each other. A tab welding portion extends from the wide end of the positive electrode 112 and negative electrode 112 for welding to the tab 111. However, because traditional power batteries require multi-tab transfer welding, the top sealing area of ​​the power battery is usually designed to be relatively large, making this area unusable and resulting in wasted space. Therefore, in this embodiment of the invention, the absorbent element 12 is placed around the tab 111, so that this area can also achieve the function of storing electrolyte, maximizing the utilization of the internal space of the battery 2.

[0057] The absorbent element 12 covers the same edge of the electrode 112 and the diaphragm 113 along the first direction H1, so that the electrolyte squeezed out from the electrode 112 or the diaphragm 113 can be quickly absorbed by the absorbent element 12, and after the electrolyte in the core package 11 is consumed, the electrolyte is transported back into the core package 11, thereby improving the transport efficiency of the absorbent element 12.

[0058] In some embodiments, refer to Figure 3 The thickness of the absorbent element 12 in its extended state is D1, and the thickness of the absorbent element 12 under 1 ton of pressure is D2, where 0.02 ≤ D2 / D1 ≤ 0.6; and / or,

[0059] The oil absorption value of absorbent element 12 is a, 0.15 g / cm³. 3 ≤a≤1.1g / cm3 .

[0060] If the compression ratio D2 / D1 is less than 0.02, meaning that the absorbent 12 will be over-compressed under relatively low pressure, the pore space available for storing electrolyte will be significantly reduced under external forces (such as collisions during battery assembly or use, or the squeezing of the absorbent 12 when the core pack 11 expands). The electrolyte absorbed by the absorbent 12 will also be easily squeezed out, making it difficult to replenish the electrolyte in the core pack 11 by storing free electrolyte. If the compression ratio D2 / D1 is greater than 0.6, it indicates that the absorbent 12 itself has high strength, making it prone to squeezing or damage to the core pack 11 or tab 111 structure under external forces. Simultaneously, the absorbent 12 has a weaker ability to absorb electrolyte and cannot effectively absorb and store surrounding free electrolyte, resulting in insufficient improvement on the cycle performance of the core pack 11.

[0061] Therefore, in this embodiment of the invention, the compression ratio D2 / D1 of the absorbent 12 is set between 0.02 and 0.6, and can be 0.02, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, etc., so that the absorbent 12 can still maintain a certain spatial structure to store electrolyte after being compressed, and can also buffer the electrolyte by generating a certain deformation when subjected to external force, reducing the probability of adverse effects on other battery components 2. It is understood that the compression ratio is usually related to the material type and internal structure of the absorbent 12, and an absorbent 12 with a suitable compression ratio can be obtained by adjusting these.

[0062] The electrolyte-holding capacity of the absorbent element 12 can also be characterized by the oil absorption value 'a', which represents the mass of electrolyte that can be held per cubic centimeter of the absorbent element 12. If the oil absorption value 'a' is less than 0.15 g / cm³, the electrolyte is considered electrolyte-holding capacity. 3 If the absorbent element 12 can hold too little electrolyte, its ability to replenish the electrolyte in the core pack 11 will be limited; if the oil absorption value is greater than 1.1 g / cm³, it will be insufficient. 3 If the absorbent element 12 absorbs too much electrolyte, it may reverse the absorption of electrolyte from the core pack 11, affecting the initial performance of the core pack 11. Furthermore, excessive electrolyte accumulation within the absorbent element 12 may cause it to aggregate, preventing it from being conducted to the core pack 11 under gravity, thus negatively impacting the circulation performance of the core pack 11. Therefore, in this embodiment, the oil absorption value 'a' of the absorbent element 12 is set at 0.15 g / cm³. 3 Up to 1.1 g / cm 3 Between these values, it can be 0.15 g / cm³. 3 0.20g / cm 3 0.25g / cm 3 0.30g / cm3 0.35g / cm 3 0.40 g / cm 3 0.60 g / cm 3 0.80g / cm 3 1.10 g / cm 3 This ensures that the absorbent 12 can absorb enough electrolyte while the mass of electrolyte inside it is not excessive, so that the electrolyte can be smoothly guided into the core package 11.

[0063] In some embodiments, the absorbent 12 includes at least one of polyethylene, polypropylene fiber, polytetrafluoroethylene, nonwoven fabric, aramid, and polyamide.

[0064] Polyethylene, polypropylene fiber, polytetrafluoroethylene, nonwoven fabric, aramid, and polyamide all possess good corrosion resistance and can store a certain amount of electrolyte, making them very suitable for manufacturing the absorbent element 12. Understandably, two or more materials can be combined to form a single absorbent element 12, thereby giving the resulting absorbent element 12 a suitable oil absorption value 'a'. Furthermore, if an absorbent element 12 is provided at each end of the core package 11, the materials of the two absorbent elements 12 can be the same or different, depending on actual needs.

[0065] In some embodiments, refer to Figure 1 The absorbent element 12 is spaced apart from the adjacent tab 111.

[0066] Since the absorbent element 12 typically stores a certain amount of electrolyte, to prevent the absorbent element 12 or the electrolyte within it from contacting the tabs 111, which could increase the heat generated by the tabs 111 during operation and increase the probability of thermal runaway inside the core package 11, this embodiment of the invention arranges the absorbent element 12 and adjacent tabs 111 at intervals, thereby improving the safety of the core package assembly 1. Specifically, the absorbent element 12 can be configured as an annular shape, allowing the tabs 111 to pass through the holes in the middle of the absorbent element 12, thus avoiding the influence of the electrolyte within the absorbent element 12.

[0067] In some embodiments, refer to Figure 1The distance between the absorbent element 12 and the adjacent tab 111 is L, where 3mm ≤ L ≤ 10mm. If L is less than 3mm, the distance between the absorbent element 12 and the tab 111 is too close, and the relatively soft absorbent element 12 can easily move closer to and contact the tab 111 under external force, affecting the normal use of the tab 111. If L is greater than 10mm, the space available for the absorbent element 12 is small, that is, the volume of the absorbent element 12 is small, resulting in the absorbent element 12 being able to hold too little electrolyte, and thus failing to play a good role in improving the cycle performance of the core pack 11. Therefore, in this embodiment of the invention, the distance L between the absorbent 12 and the tab 111 is set between 3mm and 10mm, which can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., so that the absorbent 12 and the tab 111 maintain a relatively safe distance, while the absorbent 12 can also store enough electrolyte, so that the electrolyte in the core pack 11 can be replenished more after it is consumed.

[0068] In some embodiments, refer to Figure 4 The absorbent element 12 has one or more through holes 121.

[0069] During the manufacturing process of battery 2, a formation process is required, which involves activating the positive and negative electrode active materials inside the core pack 11 through a specific charging and discharging method to form a solid electrolyte interface. During the formation process, the electrolyte in the core pack 11 decomposes into hydrogen and carbon dioxide gases. Therefore, to allow hydrogen and carbon dioxide gases to be discharged more smoothly from inside battery 2, this embodiment of the invention provides one or more through holes 121 on the absorbent 12, allowing the gas to flow through the through holes 121 and finally be discharged to the outside of battery 2 through the vent holes 211 on the battery casing 21, thereby improving the venting efficiency during formation and thus improving the production efficiency of battery 2.

[0070] In some embodiments, refer to Figure 1 and Figure 4 The core package 11 has a tab 111 on at least one side along the first direction H1; the through hole 121 includes a first through hole 1211 extending along the first direction H1. That is, controlling one end of the first through hole 1211 to face the core package 11 allows the gas produced from the core package 11 to be discharged more efficiently through the first through hole 1211, further improving the exhaust efficiency in the formation process. It is understood that multiple first through holes 1211 can be provided, and this utility model does not limit this.

[0071] In some embodiments, refer to Figure 5 The diameter of the first through hole 1211 is d1, where 1mm ≤ d1 ≤ 4mm.

[0072] If the diameter of the first through hole 1211 is less than 1 mm, the small diameter will significantly hinder gas discharge, making it prone to blockage and turbulence during gas flow, thus reducing exhaust efficiency. If the diameter of the first through hole 1211 is greater than 4 mm, the large diameter will significantly affect the structure of the absorbent 12, resulting in uneven electrolyte distribution. Electrolyte located far from the core pack 11 cannot be timely conducted into the core pack 11, thereby reducing the circulation performance of the core pack 11. Therefore, in this embodiment of the invention, the diameter d1 of the first through hole 1211 is set between 1 mm and 4 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc., to ensure that the first through hole 1211 does not significantly hinder gas flow while the structure of the absorbent 12 itself is in a state of relatively uniform mass distribution, allowing the electrolyte to be normally conducted into the core pack 11.

[0073] In some embodiments, refer to Figure 4 , Figure 6 and Figure 7 The through hole 121 also includes a second through hole 1212. One end of the second through hole 1212 communicates with the first through hole 1211, and the other end of the second through hole 1212 faces the vent hole 211 on the outer casing 21 of the battery 2. By providing a second through hole 1212 that communicates with the first through hole 1211, the gas discharged from the core pack 11 can enter the second through hole 1212 along the first through hole 1211 and finally be discharged towards the vent hole 211 on the outer casing 21 of the battery 2, further improving the venting efficiency in the formation process. It is understood that multiple second through holes 1212 can also be provided, and this utility model does not limit this.

[0074] In some embodiments, refer to Figure 8 The diameter of the second through hole 1212 is d2, and the thickness of the absorbent element 12 is D1, where 1mm ≤ d2 < D1. If the diameter of the second through hole 1212 is less than 1mm, the small diameter will significantly hinder gas discharge, making it prone to blockage and turbulence during gas flow, thus reducing exhaust efficiency. If the diameter of the second through hole 1212 is greater than D1, the diameter exceeds the thickness of the absorbent element 12, which will cause the absorbent element 12 to break. Therefore, in this embodiment of the invention, the diameter d1 of the second through hole 1212 is set to be between 1mm and D1, and can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 2mm, etc., thereby ensuring that the second through hole 1212 does not significantly hinder gas flow while the structure of the absorbent element 12 itself is relatively stable.

[0075] In some embodiments, the porosity of the through-hole 121 is b, where 10% ≤ b ≤ 30%. If the porosity b is greater than 30%, the through-hole 121 occupies too much volume, which is not conducive to the storage of electrolyte in the absorbent 12 and reduces the liquid storage capacity of the absorbent 12. If the porosity b is less than 10%, there are too few through-holes 121 for venting, which is not conducive to the discharge of gas and affects the completion efficiency of the formation process. Therefore, in this embodiment of the invention, the porosity b is set between 10% and 30%, which can be 10%, 12%, 14%, 16%, 18%, 20%, 25%, 30%, etc., so that the absorbent 12 can store enough electrolyte and ensure that the through-hole 121 has a certain volume so that the gas can be discharged quickly, thereby improving the completion efficiency of the formation process.

[0076] In some embodiments, refer to Figure 2 The core package assembly 1 also includes an insulating tape 13, which connects the core package 11 and the absorbent element 12. Specifically, one end of the insulating tape 13 is connected to the core package 11, and the other end is connected to the absorbent element 12, thus fixing the relative position between the absorbent element 12 and the core package 11. For example, the insulating tape 13 can also be positioned across the absorbent element 12, that is, one end of the insulating tape 13 is connected to the core package 11 on one side of the absorbent element 12, and the other end is connected to the core package 11 on the other side of the absorbent element 12, making the connection between the absorbent element 12 and the core package 11 tighter. It should be noted that in this case, the ports of the first through hole 1211 and / or the second through hole 1212 should be positioned away from the insulating tape 13 to prevent gas from being blocked by the insulating tape 13 in the first through hole 1211.

[0077] According to a second aspect of the present invention, a battery 2 is provided, with reference to... Figure 1 and Figure 6 ,include:

[0078] Casing 21; and,

[0079] In the foregoing embodiments, the core pack assembly 1 is disposed within the outer casing 21. Since the battery 2 includes the aforementioned core pack assembly 1, the battery 2 possesses all the beneficial effects of the aforementioned core pack assembly 1, which will not be repeated here.

[0080] According to a third aspect of this utility model, a battery pack is provided, comprising:

[0081] The battery 2 in the foregoing embodiment. Since the battery pack 2 includes the battery 2 described above, it has all the beneficial effects of the battery 2 described above, and the embodiments of this utility model will not be described again here.

[0082] According to a fourth aspect of this utility model, a vehicle is provided that includes the aforementioned battery 2 or battery pack 2, thus the vehicle possesses all the beneficial effects of the aforementioned battery 2 or battery pack 2. Further details of the embodiments of this utility model will not be repeated here. The vehicle may be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle, etc., and this application does not specifically limit it in this regard.

[0083] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A core-packaging assembly, characterized in that, include: Core package, wherein the core package is provided with electrode tabs; and, An absorbent element is disposed on the outer surface of the core package, and the absorbent element and the tab are located on the same side of the core package to absorb the electrolyte outside the core package and transfer the electrolyte to the inside of the core package.

2. The core-packaging assembly according to claim 1, characterized in that, The core package includes stacked electrodes and a diaphragm. The electrodes have tabs on at least one side edge along a first direction. The absorbent covers the same side edge of the electrodes and the diaphragm along the first direction to absorb electrolyte outside the core package and transfer the electrolyte between the electrodes and the diaphragm.

3. The core-packaging assembly according to claim 1, characterized in that, The thickness of the absorbent element in its expanded state is D1, and the thickness of the absorbent element under 1 ton of pressure is D2, where 0.02 ≤ D2 / D1 ≤ 0.6; and / or, The oil absorption value of the absorbent element is a, 0.15 g / cm³. 3 ≤a≤1.1g / cm 3 .

4. The core-packaging assembly according to claim 3, characterized in that, The absorbent component includes at least one of polyethylene, polypropylene fiber, polytetrafluoroethylene, nonwoven fabric, aramid, and polyamide.

5. The core-packaging assembly according to claim 1, characterized in that, The absorbent element is spaced apart from the adjacent tab.

6. The core-packaging assembly according to claim 5, characterized in that, The distance between the absorbent element and the adjacent tab is L, where 3mm ≤ L ≤ 10mm.

7. The core package assembly according to any one of claims 1 to 6, characterized in that, The absorbent element has one or more through holes.

8. The core-packaging assembly according to claim 7, characterized in that, The core package has the tab on at least one side along the first direction; the through hole includes a first through hole extending along the first direction.

9. The core-packaging assembly according to claim 8, characterized in that, The diameter of the first through hole is d1, where 1mm ≤ d1 ≤ 4mm.

10. The core-packaging assembly according to claim 8, characterized in that, The through hole also includes a second through hole, one end of which is connected to the first through hole, and the other end of which faces the vent hole on the battery casing.

11. The core-packet assembly according to claim 10, characterized in that, The diameter of the second through hole is d2, and the thickness of the absorbent is D1, where 1mm ≤ d2 < D1.

12. The core-packaging assembly according to claim 7, characterized in that, The porosity of the through hole is b, where 10% ≤ b ≤ 30%.

13. The core package assembly according to any one of claims 1 to 6, characterized in that, The core package assembly also includes insulating tape, and the core package and the absorbent are connected by the insulating tape.

14. A battery, characterized in that, include: shell; and, The core package assembly as claimed in any one of claims 1 to 13, wherein the core package assembly is disposed within the housing.

15. A battery pack, characterized in that, Includes the battery as described in claim 14.

16. A vehicle, characterized in that, Includes the battery as described in claim 14 or the battery pack as described in claim 15.

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